- 期刊
延長不飽和聚酯塗料可使用時間之研究（一）硬化劑配方與塗裝方式對塗料硬化反應與乾燥時間之影響
Study on the Extension of Pot-life for Unsaturated Polyester Coating (1)-Effect of Catalyst/Promoter Ratios and Finish Patterns on the Curing Reaction and Drying Time of Coating
摘要
為了解決不飽和聚酯塗料可使用時間太短的缺點，使此種具有優良特性的塗料，能為業界所樂意採用；本研究乃探討不同催化劑（MEKPO）／促進劑（Co）之配合（MEKPO：0.5%、0.75%、1.0%、2.0%，Co：0.25%、0.5%、1.0%，共得12種配合條件），對塗料可使用時間之差異，以及不受可使用時間限制之預塗法（A→B及B→A）及三明治式塗裝法（A→B→A及B→A→B）與兩液混合（MIX）後塗裝方式之乾燥時間與塗膜狀態之比較（A液：樹脂+苯乙烯+Co，B液：樹脂+苯乙烯+MEKPO），以尋求塗料之最佳配方與合適之塗裝方法。試驗結果得知，本研究所採用之MEKPO／Co配合的各種條件中，其膠化時間最長者僅達25分鐘（即MEKPO：0.5%、Co：0.25%），其餘大都在10分鐘以內，無法配合工廠之作業性，所以兩液混合之塗裝，作業上較為困難；又預塗法與三明治式塗裝法中，以B液為最上層者，即A→B及B→A→B者，塗膜均呈粘著狀態，無法乾燥，而塗膜可乾燥的B→A及A→B→A塗裝樣式中，B→A者塗膜較易全面起皺或邊緣起皺，而A→B→A者，雖其乾燥時間稍慢，但塗膜平滑度足以媲美MIX塗裝者。各種催化劑／促進劑之不同比例，及各種塗裝樣式之其他塗膜性質，將於第二報中敘述。
並列摘要
In order to solve the problem of very short pot-life of unsaturated polyester coating, various ratios of catalyst (MEKPO)/ promoter (Co) and three kinds of finish pattern were studied. The MEKPO/ Co ratios included 12 conditions were composed from MEKPO: 0.5%, 0.75%, 1.0% 2.0% and Co: 0.25%, 0.5%, 1.0%,.The finish patterns included prefinish (A→B and B→A), sandwich finish(A →B → A and B →A → B) and mix finish (A+B), The results are summarized as follows: 1. In this study, the gel time of coating using MEKPO: 0.5%' Co : 0.25% could reach 25 min only , and the other ratios of MEKPO/Co were beolw 10 min mostly. Obviousely, the mix finish (A+B) had inferior workability and can not be adopted to finish procedure for factory. 2. In the finish pattern, if the top layer was B component (resin +styrene + MEKPO) i.e. A→B (one of the prefinishes), B→ A→ B(one of the sandwich finishes) their film remained stickness and could not dry completely. 3. Among the completely dried film of B→A, A→B→A and mix finish patterns, the film of B→A pattern wrinkled easily in all or edge. Although, the drying time of A→B→A pattern was slightly slower than mix finish, but the smoothness of film could be compared favorably with the mix finish pattern.